[ ?39 ] 
CHAP. XII. 
O f the mufcular or flefhy Fibres g^AninSals. 
T H E flejhy Fibres of the Mufcks (ac¬ 
cording to the Obfervations of Mon- 
fieur Muys) are compofed of other fmaller 
Fibres or Fibrils, the Size of a flender Hair; 
five or fix hundred of which Fibrils go to 
the making up of one flejhy Fibre , whofe 
Diameter is no more than the twenty-fourth 
Part of an Inch. Each of thefe Fibrils is 
again compofed of more than three hundred 
fmall tranfparent Fubulf fo extremely {len¬ 
der, that were one of thofe Blood-Globules 
(which Mr. Leeuwenhoek fuppofes but 
the millionth Part of a Grain of Sand) di¬ 
vided into twenty-four Parts, even thefe 
minute Parts could hardly enter and pafs 
through fuch exceedingly fnihll Tubes. And 
yet, that they do enter and pafs through 
them, is evident by the Rednefs of the Flefh 
of Animals.. We mu ft therefore infer, that 
the Fubuli forming a Fibril are really hol¬ 
low ; that the Extremities of the Arteries 
open into them, and empty there a Part of 
their Liquor, which is carried back again by 
the Veins to the Heart ; and that the Glo¬ 
bules of the Blood are, for this Purpofe, 
divided into Parts inconceivably fmall 
*.Vi.d« Philofoph. TranfaSI , Numb. 339* 
Vo l . I. L 
Mr, 
